NSRR staff
Boston, MA
0000-0002-0506-8368
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Thanks for using the site. Unfortunately, the Compumedics Profusion software did not provide "linking" information between respiratory events, desaturation events, and arousal events in the XML annotations. I discussed this with another user in this thread, which you may find helpful: https://sleepdata.org/forum/xml-annotations-do-not-match-ahi/
The variables like hrembp, hrop, canop, etc. were derived by the Profusion scoring software and output to the sleep study report.
You are correct that RDI is a misnomer in many of the NSRR datasets since RERAs were not generally scored. My understanding is that the definition of RDI has shifted over time, e.g., in the mid-1990's when the Sleep Heart Health Study (SHHS) was conducted the RDI was equivalent to what we now call the AHI. The RDI label stuck in the data processing that was re-used from dataset to dataset.
Yes, the IDs should align in the manner you describe.
Thanks for asking the question and for also using the SOF Online website!
NSRR only hosts data for the 461 SOF subjects who took part in the home sleep testing portion of Visit 8. The overall SOF cohort is much larger, as you've seen from the SOF Online datasets.
Thanks for using the site - these variables from the scoring notes form (https://sleepdata.org/datasets/shhs/files/m/browser/forms/shhs1/SHHS%201%20PSG%20Scoring%20Notes%20Form.pdf) pertain to completeness of the recording. The home sleep monitors from the mid-1990s had challenges with memory card size and batteries (as compared to more modern devices). As such, many recordings were "incomplete", either starting in sleep or ending in sleep (for example).
I believe restan1 is a general indicator about whether the recording appeared (to the scorer) to capture the entire sleep period or not.
The ORP variables are in the eeg-biomarkers dataset (not the main shhs1 dataset), have you looked there?
https://sleepdata.org/datasets/shhs/files/datasets/eeg-biomarkers
Thanks for using the site!
Here is some related reading - EEG polarity issues in the NSRR, by Shaun Purcell and Michael Prerau (Apr 2019)
Source: https://zzz.bwh.harvard.edu/luna/vignettes/
No, I don't believe respiratory rate was output from SHHS (or other studies scored in Compumedics Profusion). Perhaps it could be computed from the raw EDF signal.
Are you referring to the MESA dataset (https://sleepdata.org/datasets/mesa/)? Blood pressure data were not shared with NSRR. They can be requested through the MESA Coordinating Center (https://mesa-nhlbi.org/).
The SHHS polysomnography scoring annotation files are located here: https://sleepdata.org/datasets/shhs/files/polysomnography/annotations-events-profusion
Thanks for checking out the site. I think you are referencing this old forum thread: https://sleepdata.org/forum/o2-desat-events-for-odi-calculation/
ndes*ph/slptime would be the correct way to calculate ODI, however the numerator may inadvertently include desaturations in wake time that shouldn't be included in the calculation. A better way to calculate may be to use the XML annotation files and then identifying SpO2 Desaturations that occurred strictly in sleep epochs.